From patchwork Mon Mar 7 03:22:58 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cao jin X-Patchwork-Id: 8514981 Return-Path: X-Original-To: patchwork-qemu-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 14DD8C0553 for ; Mon, 7 Mar 2016 03:22:42 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 2B0372013A for ; Mon, 7 Mar 2016 03:22:41 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1004D20138 for ; Mon, 7 Mar 2016 03:22:40 +0000 (UTC) Received: from localhost ([::1]:53248 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aclkl-0000Ng-Ad for patchwork-qemu-devel@patchwork.kernel.org; Sun, 06 Mar 2016 22:22:39 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51128) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aclkS-0000Dq-OH for qemu-devel@nongnu.org; Sun, 06 Mar 2016 22:22:24 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aclkR-0001Ow-BG for qemu-devel@nongnu.org; Sun, 06 Mar 2016 22:22:20 -0500 Received: from [59.151.112.132] (port=53491 helo=heian.cn.fujitsu.com) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aclkP-0001Bz-Bm for qemu-devel@nongnu.org; Sun, 06 Mar 2016 22:22:19 -0500 X-IronPort-AV: E=Sophos;i="5.22,518,1449504000"; d="scan'208";a="4286093" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 07 Mar 2016 11:21:58 +0800 Received: from G08CNEXCHPEKD01.g08.fujitsu.local (unknown [10.167.33.80]) by cn.fujitsu.com (Postfix) with ESMTP id 9A99C42AC84B; Mon, 7 Mar 2016 11:21:58 +0800 (CST) Received: from G08FNSTD140223.g08.fujitsu.local (10.167.226.69) by G08CNEXCHPEKD01.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.181.6; Mon, 7 Mar 2016 11:21:58 +0800 From: Cao jin To: Date: Mon, 7 Mar 2016 11:22:58 +0800 Message-ID: <1457320984-6540-6-git-send-email-caoj.fnst@cn.fujitsu.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1457320984-6540-1-git-send-email-caoj.fnst@cn.fujitsu.com> References: <1457320984-6540-1-git-send-email-caoj.fnst@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.69] X-yoursite-MailScanner-ID: 9A99C42AC84B.AE338 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: caoj.fnst@cn.fujitsu.com X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 59.151.112.132 Cc: chen.fan.fnst@cn.fujitsu.com, izumi.taku@jp.fujitsu.com, alex.williamson@redhat.com, mst@redhat.com Subject: [Qemu-devel] [PATCH v2 05/11] vfio: add check host bus reset is support or not X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Chen Fan when boot up a VM that assigning vfio devices with aer enabled, we must check the vfio device whether support host bus reset. because when one error occur. OS driver always recover the device by do a bus reset, in order to recover the vfio device, qemu must to do a host bus reset to reset the device to default status. and for all affected devices by the bus reset. we must check them whether all are assigned to the VM. Signed-off-by: Chen Fan --- hw/vfio/pci.c | 218 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-- hw/vfio/pci.h | 1 + 2 files changed, 212 insertions(+), 7 deletions(-) diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index 8ec9b25..0898e34 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -1868,6 +1868,197 @@ static int vfio_add_std_cap(VFIOPCIDevice *vdev, uint8_t pos) return 0; } +static bool vfio_pci_host_slot_match(PCIHostDeviceAddress *host1, + PCIHostDeviceAddress *host2) +{ + return (host1->domain == host2->domain && host1->bus == host2->bus && + host1->slot == host2->slot); +} + +static bool vfio_pci_host_match(PCIHostDeviceAddress *host1, + PCIHostDeviceAddress *host2) +{ + return (vfio_pci_host_slot_match(host1, host2) && + host1->function == host2->function); +} + +struct VFIODeviceFind { + PCIDevice *pdev; + bool found; +}; + +static void vfio_check_device_noreset(PCIBus *bus, PCIDevice *pdev, + void *opaque) +{ + DeviceState *dev = DEVICE(pdev); + DeviceClass *dc = DEVICE_GET_CLASS(dev); + VFIOPCIDevice *vdev; + struct VFIODeviceFind *find = opaque; + + if (find->found) { + return; + } + + if (!object_dynamic_cast(OBJECT(dev), "vfio-pci")) { + if (!dc->reset) { + goto found; + } + return; + } + vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev); + if (!(vdev->features & VFIO_FEATURE_ENABLE_AER) && + !vdev->vbasedev.reset_works) { + goto found; + } + + return; +found: + find->pdev = pdev; + find->found = true; +} + +static void vfio_check_host_bus_reset(VFIOPCIDevice *vdev, Error **errp) +{ + PCIBus *bus = vdev->pdev.bus; + struct vfio_pci_hot_reset_info *info = NULL; + struct vfio_pci_dependent_device *devices; + VFIOGroup *group; + struct VFIODeviceFind find; + int ret, i; + + ret = vfio_get_hot_reset_info(vdev, &info); + if (ret) { + error_setg(errp, "vfio: Cannot enable AER for device %s," + " device does not support hot reset.", + vdev->vbasedev.name); + return; + } + + /* List all affected devices by bus reset */ + devices = &info->devices[0]; + + /* Verify that we have all the groups required */ + for (i = 0; i < info->count; i++) { + PCIHostDeviceAddress host; + VFIOPCIDevice *tmp; + VFIODevice *vbasedev_iter; + bool found = false; + + host.domain = devices[i].segment; + host.bus = devices[i].bus; + host.slot = PCI_SLOT(devices[i].devfn); + host.function = PCI_FUNC(devices[i].devfn); + + /* Skip the current device */ + if (vfio_pci_host_match(&host, &vdev->host)) { + continue; + } + + /* Ensure we own the group of the affected device */ + QLIST_FOREACH(group, &vfio_group_list, next) { + if (group->groupid == devices[i].group_id) { + break; + } + } + + if (!group) { + error_setg(errp, "vfio: Cannot enable AER for device %s, " + "depends on group %d which is not owned.", + vdev->vbasedev.name, devices[i].group_id); + goto out; + } + + /* Ensure affected devices for reset on the same slot */ + QLIST_FOREACH(vbasedev_iter, &group->device_list, next) { + if (vbasedev_iter->type != VFIO_DEVICE_TYPE_PCI) { + continue; + } + tmp = container_of(vbasedev_iter, VFIOPCIDevice, vbasedev); + if (vfio_pci_host_match(&host, &tmp->host)) { + /* + * AER errors may be broadcast to all functions of a multi- + * function endpoint. If any of those sibling functions are + * also assigned, they need to have AER enabled or else an + * error may continue to cause a vm_stop condition. IOW, + * AER setup of this function would be pointless. + */ + if (vfio_pci_host_slot_match(&vdev->host, &tmp->host) && + !(tmp->features & VFIO_FEATURE_ENABLE_AER)) { + error_setg(errp, "vfio: Cannot enable AER for device %s, on same slot" + " the dependent device %s which does not enable AER.", + vdev->vbasedev.name, tmp->vbasedev.name); + goto out; + } + + if (tmp->pdev.bus != bus) { + error_setg(errp, "vfio: Cannot enable AER for device %s, " + "the dependent device %s is not on the same bus", + vdev->vbasedev.name, tmp->vbasedev.name); + goto out; + } + found = true; + break; + } + } + + /* Ensure all affected devices assigned to VM */ + if (!found) { + error_setg(errp, "vfio: Cannot enable AER for device %s, " + "the dependent device %04x:%02x:%02x.%x " + "is not assigned to VM.", + vdev->vbasedev.name, host.domain, host.bus, + host.slot, host.function); + goto out; + } + } + + /* + * Check the all pci devices on or below the target bus + * have a reset mechanism at least. + */ + find.pdev = NULL; + find.found = false; + pci_for_each_device(bus, pci_bus_num(bus), + vfio_check_device_noreset, &find); + if (find.found) { + error_setg(errp, "vfio: Cannot enable AER for device %s, " + "the affected device %s does not have a reset mechanism.", + vdev->vbasedev.name, find.pdev->name); + goto out; + } + +out: + g_free(info); + return; +} + +static void vfio_check_devices_host_bus_reset(Error **errp) +{ + VFIOGroup *group; + VFIODevice *vbasedev; + VFIOPCIDevice *vdev; + Error *local_err = NULL; + + /* Check All vfio-pci devices if have bus reset capability */ + QLIST_FOREACH(group, &vfio_group_list, next) { + QLIST_FOREACH(vbasedev, &group->device_list, next) { + if (vbasedev->type != VFIO_DEVICE_TYPE_PCI) { + continue; + } + vdev = container_of(vbasedev, VFIOPCIDevice, vbasedev); + if (vdev->features & VFIO_FEATURE_ENABLE_AER) { + vfio_check_host_bus_reset(vdev, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + } + } + } + + return; +} + static int vfio_setup_aer(VFIOPCIDevice *vdev, uint8_t cap_ver, int pos, uint16_t size) { @@ -2047,13 +2238,6 @@ static void vfio_pci_post_reset(VFIOPCIDevice *vdev) vfio_intx_enable(vdev); } -static bool vfio_pci_host_match(PCIHostDeviceAddress *host1, - PCIHostDeviceAddress *host2) -{ - return (host1->domain == host2->domain && host1->bus == host2->bus && - host1->slot == host2->slot && host1->function == host2->function); -} - static int vfio_pci_hot_reset(VFIOPCIDevice *vdev, bool single) { VFIOGroup *group; @@ -2559,6 +2743,21 @@ static void vfio_unregister_req_notifier(VFIOPCIDevice *vdev) vdev->req_enabled = false; } +static void vfio_pci_machine_done_notify(Notifier *notifier, void *unused) +{ + Error *local_err = NULL; + + vfio_check_devices_host_bus_reset(&local_err); + if (local_err) { + error_report_err(local_err); + exit(1); + } +} + +static Notifier machine_notifier = { + .notify = vfio_pci_machine_done_notify, +}; + static int vfio_initfn(PCIDevice *pdev) { VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev); @@ -2905,6 +3104,11 @@ static const TypeInfo vfio_pci_dev_info = { static void register_vfio_pci_dev_type(void) { type_register_static(&vfio_pci_dev_info); + /* + * Register notifier when machine init is done, since we need + * check the configration manner after all vfio device are inited. + */ + qemu_add_machine_init_done_notifier(&machine_notifier); } type_init(register_vfio_pci_dev_type) diff --git a/hw/vfio/pci.h b/hw/vfio/pci.h index e0c53f2..aff46c2 100644 --- a/hw/vfio/pci.h +++ b/hw/vfio/pci.h @@ -15,6 +15,7 @@ #include "qemu-common.h" #include "exec/memory.h" #include "hw/pci/pci.h" +#include "hw/pci/pci_bus.h" #include "hw/pci/pci_bridge.h" #include "hw/vfio/vfio-common.h" #include "qemu/event_notifier.h"